Tank vapor pressure control system

Details Tank vapor pressure control system Tank vapor pressure control system

1993-12-08

1995-05-16

Nilson, Robert G.

Fluid handling

Processes

Involving pressure control

62 481, 62 482, 137210, 137340, 137587, 141 59, 141 65, 141 82, 141290, F17C 702

Patent

active

054151961

ABSTRACT:
A vapor pressure control system for controlling the vapor pressure in a fuel storage tank is provided which comprises a cooling chamber for cooling the fuel vapor, wherein the temperature of the cooling chamber is maintained at a point slightly above the freezing point of water. Vapor intake and return lines provide for communication of the fuel vapor between the tank and the cooling chamber. A fan interposed in the intake line causes the circulation of the fuel vapor between the tank and the cooling chamber. The fan is operated by a pressure sensitive switch which causes the fan to run when the difference between the ambient air pressure and tank vapor pressure falls below a certain minimum level, and which causes the fan to stop when the difference between the ambient air pressure and tank vapor pressure rises above a certain, maximum level. The fan is shut off by a temperature sensitive switch when the ambient temperature approaches the freezing point of water.

REFERENCES:
patent: 3791422 (1974-02-01), Johnson
patent: 3956903 (1976-05-01), Hiller
patent: 4100758 (1978-07-01), Mayer
patent: 4671071 (1987-06-01), Sasaki

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